The Collaborative International Dictionary of English v.0.48:

Cortex \Cor"tex\ (k[^o]r"t[e^]ks), n.; pl. Cortices (-t?-s?z).
   [L., bark. Cf. Cork.]
   1. Bark, as of a tree; hence, an outer covering.
      [1913 Webster]

   2. (Med.) Bark; rind; specifically, cinchona bark.
      [1913 Webster]

   3. (Anat.) The outer or superficial part of an organ; as, the
      cortex or gray exterior substance of the brain.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cortex
    n 1: the layer of unmyelinated neurons (the grey matter) forming
         the cortex of the cerebrum [syn: cerebral cortex,
         cerebral mantle, pallium, cortex]
    2: the tissue forming the outer layer of an organ or structure
       in plant or animal [ant: medulla]
    3: the tissue that surrounds the lens nucleus [syn: lens
       cortex, cortex]

The Free On-line Dictionary of Computing (19 January 2023):

Cortex

   An experimental slow controls project at CERN.

   (1994-11-30)